linux-kernel - Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP function call

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Date:	Tue, 5 Apr 2016 13:55:43 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	rcochran@...utronix.de
Cc:	Sebastian Andrzej Siewior <sebastian.siewior@...utronix.de>,
	Anna-Maria Gleixner <anna-maria@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	rt@...utronix.de
Subject: Re: [PREEMPT-RT] [PATCH] s390/cpum_sf: Remove superfluous SMP
 function call

On Tue, Apr 05, 2016 at 01:51:29PM +0200, rcochran@...utronix.de wrote:
> On Tue, Apr 05, 2016 at 01:36:38PM +0200, Heiko Carstens wrote:
> > On Tue, Apr 05, 2016 at 01:23:36PM +0200, Heiko Carstens wrote:
> > > Subsequently, in this case, the setup_pmc_cpu() call will be executed on
> > > the wrong cpu.
> > 
> > .. or to illustrate this behaviour: the following patch (white space
> > damaged due to copy-paste) results in the following:
> 
> I guess you are missing the following commit?
> 
> 
> commit 1cf4f629d9d246519a1e76c021806f2a51ddba4d
> Author: Thomas Gleixner <tglx@...utronix.de>
> Date:   Fri Feb 26 18:43:39 2016 +0000
> 
>     cpu/hotplug: Move online calls to hotplugged cpu

No. It's included. I'm using latest Linus' master tree with git head being
1e1e5ce78ff0 "Merge tag 'linux-kselftest-4.6-rc3' of
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest"

# uname -a
Linux p2345007 4.6.0-rc2-00042-g1e1e5ce78ff0-dirty #3 SMP PREEMPT Tue Apr 5 13:30:02 CEST 2016 s390x s390x s390x GNU/Linux